Machine for heating the surface of roads for covering the same with poured asphalt.



A. GRAS SO. v v MACHINE FOR HEATING THE SURFACE OF ROADS FOR COVERING THE SAME WITH POURED ASPHALT.

APPLICATION FILED MAR. 17, 1913.

Patented D60. 29, 1914.

2 SHEETSSHEET 1 Wi'izz armed A. GRASSO.

MACHINE FOR HEATING THE SURFACE OF ROADS FOR COVERING THE SAMEWITH-POURBD ASPHALT.

'APPLI UATION FILED MAR.17,1913.

UNITED sTATEs PATEnToF ioE.

.ALFIO enlisso, or. LIVORNO, ITALY.

MACHINE FOR HEATING THE SURFACE O1? ROADS FOR COVERING THE SAME WITH POUEED ASPHALT. Y 1

GRAsso, a sub- Italy,

have invented certain new and usefulIma provements in Machines for Heating the Surface of Roads for Covering the Same with Poured Asphalt, of which the follow-' ing is a specification.

The present invention relates to a wheeled machine, which is intended to be used for heating the surface of the road for covering the same with poured asphalt.

' pera ture.

- the asphalt may flow 'of angle-irons and is For applying a poured layer of asphalt onroads it is necessary to previously heat the surface of the road to a suitable tem- It is for this purpose, that the machine of the present invention is intended.

The invention consists essentially in that the hot gases from one or several stoves arranged on the machine are conducted-beneath the bottom of the machine, which bottom is situated above the surface of the road, and which has hinged gates at the sides, reaching down almost to the road surface. By such means a kind of hood is formed over the respective part. of the road, beneathwhich the hot gases can have a greater 'effect. 3

The hot gases are forced under the bottom of the machine by a blast produced by a fan driven by an engine. Preferably this engine is also employed for advancing the machine. The machine is also provided with a tank in which the asphalt is melted by the heat of thestoves, and from which on to the surface of the road;

' In the accompanying drawing a constructional form of the machine according to'.

the present invention is exemplified.

Figures 1 and 1" constitute a longitudinal section on the line I-l in Fig. 2. Figs. 2

'and 2 constitute a plan, partly in section on the line 11-11 in Fig. 1. Y

The machine consists essentially of a boxshaped body 1, which is preferably made covered with metallic plates. The body runs on four wheels 2, 2'and 3, 3 and the front wheels of-these, 2, 2 can be turned by means of a steering wheel 4 which tank 5 may serve as a water tank,

Specification of Letters Patent.

and resident of 4- engine shaft is Patented Dec. 29, 1914..

Application filed March 1 7, 1913; Serial No. 755,054.

tank 6 as fuel tank, tank 7 as asphalt tank,

and tank 8 as mineral oil tank. On the forward part of the body 1 is arranged a combustion engine 9, which serves various purposes. From the engine 9 a fan 10 is driven by suitable gearing, which fan may be engaged and disengaged at will by means of a hand wheel 11. To the delivery pipe of the fjanis connected a pipe 12, which leads to two stoves arranged on the rear part of the body 1. Each of these stoves ma'yconsist iof a castiron body 13, which-is surrounded by a metal shell 14. The air passing ffrom the pipe 12 into the stoves will flow from above and from the side into the fire on the grate 15. The air supply is controlled by means of a valve 16. The fuel is introduced into the stove through a-door 17, and a lower door 18 is provided for cleaning the stove. The hot gases are carrled downward by the blast and are spread by a spreader 19. They then pass under the bottom 20 of the body 1, which bottom is about 15 centimeters-:6 inches abo e the surface of the road. For keeping thehot gases together under the latter andforcing them to act on the surface of the road gates 21 are providedat the lower edges of the body, which gates reach almost down to the surface of the road and can be adiusted according to requirement. For this purpose the gates 21 are held by means of chains or the like. The hot gases are then allowed to escape through suitably provided openings.

The engine 9 at the same t'imese cs to uniformly advance the whole machine. For this purposea crank 22 is fitted to the fee end of the engine shaft, and the crank pin is connected to the one-end of a member 23. The other end of said member 23 engages with a vertical rocking bar 24, the member 23 being hinged to a screwing sleeve 25, which screws on a thread on said rock ng bar 24. Below this sleeve 23 is arranged a second sleeve 26, which is connected by a member 27 to pin 28.

The bar 24 has both right and left hand threads, so that when it is turned by means of a hand wheel 29 the two sleeves 25 and 26 may be approached to or removed from each other. By the adjustment of sleeve 25 the size of the stroke of the bar .2 is controlled. By these means the rotary motion of the transmitted to a shaft 30.

left hand threads, so that the two sleeves canbe approached to and removed from each other for varylng the speed, sayfor varying the travel of the machine between I v and 100 meters perminute. The speed of the machine must be varied accordingly as a large or small piece of gravel covered road is to be heated for asphalting. Between the two stoves a boiler 39 is arranged, in which the asphalt to be poured is melted by the heat radiating from the two stoves. While the machine is slowly advancing the molten asphalt runs out through cock on to the surface of the road, where it is evenly distributed and rolled down. i

For quickly returning themachine to its starting point' after it has traveled a dis tance corresponding to its size, a sprocket wheel is fitted to the engine shaft, from which wheel the motion is transmitted by means of an endless chain 34 to a gearing, which is arranged in the casing For changing from the slow advance of the machine to the fast return it is necessary to sever the connection between the member 27 and the pinQS. Then the gearing contained in the casing 35 is engaged by means of levers 37 and 38 of which the one controls the reversing of the gear and the other the changing of the speed. From this gearing the shaft 30 is driven, from which the chain 23]. transmits, as hereinbefore described, the

.motion to the rear axle During the return of the ma chine and for treating a fresh strip of road, the fan 10 18 of course first disconnected and the gatesv21 are raised, so that they do not come into contact with the road surface. The, hereinbefere described ar rangement also serves to advance the machine on ordinary roads. For facilitating the transport the journals of the wheels 2 and 3 are vertically adjustable in guides -11,

ing a boxsh'aped frame, reaching nearly down to the surface of the road, Wheels'on said frame, and stoves arranged on the latter, a fan driven byan engine and producing a current of air adapted to force the hot gases from said stoves under said bonshaped frame, said frame having hinged to the latter, and reaching nearl} down to the surface of the road, and adapted to retain the hot gases, within said boxshaped frame, a tank arranged on said frame and adapted to have the asphalt melted therein by the heat of said stoves, and n'zeans for distributing the melted asphalt from said tank on to the surface of the road heated by said hot gases.

. In testimony whereof l have hereunto signed my name this 24th day of February 1913, in the presence of two subscribin'gwitnesses.

ALFIO GRASSU.

l Vitn'esses FRANK DEEDMEYER, CESARE CERVI. 

